99999900999999 has 256 divisors, whose sum is σ = 216304980111360. Its totient is φ = 43911522385920.

The previous prime is 99999900999991. The next prime is 99999901000019.

99999900999999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99999900999999 - 2³ = 99999900999991 is a prime.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99999900999999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999900999991) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 14058807 + ... + 19941159.

It is an arithmetic number, because the mean of its divisors is an integer number (844941328560).

Almost surely, 2^{99999900999999} is an apocalyptic number.

99999900999999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99999900999999 is an abundant number, since it is smaller than the sum of its proper divisors (116305079111361).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999900999999 is a wasteful number, since it uses less digits than its factorization.

99999900999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882447 (or 5882441 counting only the distinct ones).

The product of its (nonzero) digits is 282429536481, while the sum is 108.

It can be divided in two parts, 99999900 and 999999, that multiplied together give a square (99999800000100 = 9999990²).

The spelling of 99999900999999 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred million, nine hundred ninety-nine thousand, nine hundred ninety-nine".